First of all where an amplifier is made is not important, manufacturing is portable. What is important is the design, engineering, testing, and parts specificstion and quality.
The a21+ is a recently designed and tested amplifier by a legendary amp designer.
The Adcom looks impressive and has impressive specs but who designed it? How and where was it engineered and tested? What is the quality level of the electronic components?
The a21+ essentially puts out the same power per the stereophile test, stays class A for a useable amount of power and sounds excellent as witnessed by the stereophile class A rating.
A no brainer for me.
The a21+ is a recently designed and tested amplifier by a legendary amp designer.
The Adcom looks impressive and has impressive specs but who designed it? How and where was it engineered and tested? What is the quality level of the electronic components?
The a21+ essentially puts out the same power per the stereophile test, stays class A for a useable amount of power and sounds excellent as witnessed by the stereophile class A rating.
A no brainer for me.